Surprising doctor visit!!

My last menstrual cycle was Aug. 15th. So I thought I was 13 weeks pregnant. I went in for my 13th week sonogram (first sonogram) at my clinic. It turns out I'm only 8 weeks along!! I was so surprised and shocked I didn't know what to say. The entire time I thought I was further along. I thought I was showing more, my stomach got harder, and when I first took a test at what I thought was 9 weeks it showed a strong positive, even taken away the dye from the control line on every one of the test I took. But I got to see my little babys heart beat, I couldnt hear it just yet but I got to see it and see that little miracle bean inside me. I was happy to hear that everything looked good so far and with me being 8 weeks only, means I get to experience this even longer. I just hope from here to 12 or 13 weeks everything will be okay when the miscarriage rate drops.😕 This is my first pregnancy!